本文介绍了快速错误:无法分配给不变值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
对于此代码段,我收到了上面的错误:
I got the error above for this code snippet:
func store(name: String, inout array: [AnyObject]) {
for object in array {
if object is [AnyObject] {
store(name, &object)
return
}
}
array.append(name)
}
有什么想法吗?
推荐答案
用for
提取的项目object
是不可变的.您应该改为迭代数组的indices
.
the item object
extracted with for
is immutable. You should iterate indices
of the array instead.
而且,该项是AnyObject
,如果不进行强制转换,则不能将其传递给inout array: [AnyObject]
参数.在这种情况下,应将其强制转换为可变的[AnyObject]
,然后重新分配:
And, the item is AnyObject
you cannot pass it to inout array: [AnyObject]
parameter without casting. In this case, you should cast it to mutable [AnyObject]
and then reassign it:
func store(name: String, inout array: [AnyObject]) {
for i in indices(array) {
if var subarray = array[i] as? [AnyObject] {
store(name, &subarray)
array[i] = subarray // This converts `subarray:[AnyObject]` to `NSArray`
return
}
}
array.append(name)
}
var a:[AnyObject] = [1,2,3,4,[1,2,3],4,5]
store("foo", &a) // -> [1, 2, 3, 4, [1, 2, 3, "foo"], 4, 5]
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